N-Alkyl-N-methylpyrrolidinium Difluoro(oxalato)borate Ionic Liquids: Physical/Electrochemical Properties and Al Corrosion
NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF CHEMICAL ENGINEERING
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The synthesis and physical properties of difluorooxalatoborate DFOB--based ionic liquids ILs are reported with N-alkyl-N-methylpyrrolidinium PY1R cations with butyl, pentyl and hexyl alkyl chains. The PY14DFOB and PY16DFOB salts have a melting point Tm of -5 deg C and 31 deg C, respectively, whereas the PY15DFOB salt does not crystallize. Instead, this salt has a glass transition temperature Tg of -74 deg C. Electrolytes composed of these ILs are noncorrosive towards Al when mixed with LiTFSI and LiFSI, as well as with LiPF6 or LiDFOB. The exceptional oxidative stability of these ILs suggests that they may be suitable for battery electrolyte applications.
- Physical Chemistry
- Electrochemical Energy Storage